Space Shuttle Discovery makes the turn toward Launch Pad 39B on its trek atop the
mobile launcher platform and crawler transporter. Once at the pad, the orbiter, external tank and solid rocket boosters will
undergo final preparations for the STS-103 launch targeted for December 6, 1999, at 2:37 a.m. EST.

The mission is a "call-up"
due to the need to replace and repair portions of the Hubble Space Telescope. Although Hubble is operating normally and
conducting its scientific observations, only three of its six gyroscopes are working properly. Four EVA's are planned to
make the necessary repairs and replacements on the telescope.